![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDz_9ghhHWe3MxylkC19JRkVeLiRNaVDouXjM3Uz70Gq_d-3QaLvT0lg4Bxp65D3j2mch5t64TCAzuWtRAhUiWMrwq9Rs8GQ6eA0ncyZ9vkAtY5QlSdp8_yvr3musfCMb-DIbJnO8IuQWU/s400/iTunesGenre.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3fPn8Uaeci3OD7nycgTYjpMShFEdHnhbQGeXJzhLrp9tsp5k5zuVGVe3JbLWjODkShb8PUQXUcoVi3_UcdcrUsEGFWUQo3qG8AzfKaERljWvoNZw6ebRZWYa9v_bDgg-XPyII4CzsEFSv/s200/ITunesData.png)
Analysis
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3YyHYixTJAXY91EBmoHm4s2Jdr8lnS6qjCjWK-LuBpz4IFKIaR33vUtQVHg8FWDJXhXQAIERuvQfdUVvfCX0LzgMzhSkStA5axdPMSgpwZXwEndq1x3oofpL1fkRd-Ytp0a_6qn1xrtdC/s320/iTunesDesmos.png)
One thing that I think is interesting is that you would expect a very strong (if not perfect) relationship between the time of a song and it's file size. But as you can see there seems to be different relationships. This is due to the bit rate of the file compression. So you might be able to have a conversation about what bit rate is and how it relates to the compression of the file. The lower the bit rate the smaller the file size (for songs of the same length). So you could talk about why you would want a lower or higher bit rate (hint: lower bit rate means poorer quality of the sound but smaller file size, so there is a trade off). In CODAP you can create separate graphs of the bit rate data and the scatter plot of the size vs time then high lite parts of the data to show the different relationships. You could actually hide or show data based on the bit rate to do more specific analysis by isolating just the data from one bit rate.
Sample Questions
- Choose three numerical attributes from your data and determine the mean, median and SD of each. Graph each attribute using an appropriate representation.
- Which genre of music has the highest average song length?
- Which song was played the most?
- Which decade has the most songs?
- Which song was skipped the most?
- Determine the relationship between the size of a file and how long the song is for different bit rates.
- You have only 50 Mb of space left on your device. How many minutes of music could you store using all of the remaining space (note that answers will vary based on the bit rate.
Downloads
- Sample data from my iTunes Library (Google Sheets, CSV, Desmos, CODAP)
- Some sample Graphs (Desmos, CODAP)
Let me know if you used this data set or if you have suggestions of what to do with it beyond this.